# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0261059        0.00700631    
     0.460000          0.700000         0.0231082        0.00661772    
     0.700000           1.00000         0.0386275        0.00773846    
      1.00000           1.54000         0.0396181        0.00999258    
      1.54000           2.40000         0.0505941         0.0133070    
      2.40000           4.80000         0.0600569         0.0160134    
      4.80000           10.0000         0.0851582         0.0253559